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Published December 14, 2016 | Supplemental Material
Journal Article Open

Exceptional resilience of small-scale Au_(30)Cu_(25)Zn_(45) under cyclic stress-induced phase transformation


Shape memory alloys that produce and recover from large deformation driven by martensitic transformation are widely exploited in biomedical devices and micro-actuators. Generally their actuation work degrades significantly within first a few cycles, and is reduced at smaller dimensions. Further, alloys exhibiting unprecedented reversibility have relatively small superelastic strain, 0.7%. These raise the questions of whether high reversibility is necessarily accompanied by small work and strain, and whether high work and strain is necessarily diminished at small scale. Here we conclusively demonstrate that these are not true by showing that Au_(30)Cu_(25)Zn_(45) pillars exhibit 12 MJ m^(−3) work and 3.5% superelastic strain even after 100,000 phase transformation cycles. Our findings confirm that the lattice compatibility dominates themechanical behavior of phase-changing materials at nano to micron scales, and points a way for smart micro-actuators design having the mutual benefits of high actuation work and long lifetime.

Additional Information

© 2016 American Chemical Society. Received 24 August 2016; Published online 4 November 2016. XC acknowledge the financial support of the HK Research Grants Council through Early Career Scheme under Grant No. 26200316 and UGC Fund B002-0172-R9358. XN and JRG acknowledge the financial support of the U.S. Department of Energy through Early Career Research Program under Grant No. DE-SC0006599. KB and RDJ acknowledge the financial support of the Air Force Office of Scientific Research through MURI Grant No. FA9550-12-1-0458. The research of RDJ was also supported by NSF-PIRE (OISE-0967140), MURI (W911NF-07-1-0410 administered by AFOSR), ONR (N00014-14-1-0714), NSF-DMREF 1629160, the RDF Fund of the Institute on the Environment (UMN) and AFOSR (FA9550-15-1-0207).The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.

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Supplemental Material - nl6b03555_si_003.avi


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